TRAXX if you have a droid phone look for an app called Speed Gauge. It's pretty accurate and reads to tenths of a mph. Grab a suction cup mount for your phone and clogged speedos wont be a big deal anymore.

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I spent most of my money on booze, broads and boats. The rest I wasted. - Elmore Leonard
I had always thought that there was nothing quite so sad as an abandoned boat.-Terry Hayes

Its a little tricky. But you have to select Simple display and then select mirror (white rectangle on top bar left of orange settings button) for it to work. Somehow it says you can change the colors but that might be on the pay version. I use simple display and mirror it. But you can play around with the other displays.

Oh to start it you have to hit the red circle bottom left. Then the orange box to stop it.

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When I was a child, I used to talk as a child, think as a child, reason as a child; when I became a man, I put aside childish things.
1 Corinthians Chapter 13 - 11

Here's my son surfing on our first day out on our X-35. We're sufficiently clueless that we didn't even know he should have surfed the port side so we wouldn't be backside -- oh well, we can try that this weekend. At least he was able to go ropeless on his first day surfing. Obviously, my surf wake could be better -- this is with stock balast and the surf tab deployed. Now I get to start every wake surfer's favorite past-time: tweaking their wake...